雷达多视极化检测器性能对比分析  

Contrastive analysis of the performances of radar multi-look polarimetric detectors

作　　者：张鹏[1] 张嘉峰 刘涛[1] ZHANG Peng;ZHANG Jiafeng;LIU Tao(School of Electronic Engineering, Naval University of Engineering, Wuhan 430000, Chin)

机构地区：[1]海军工程大学电子工程学院,武汉430000

出　　处：《电波科学学报》2017年第4期416-426,共11页Chinese Journal of Radio Science

基　　金：国家自然科学基金(基于对数空间理论的极化SAR图像舰船目标检测新方法61372165;基于协方差矩阵的极化干涉SAR图像海面慢动目标检测新方法研究61771483)

摘　　要：雷达极化检测器性能对比分析可为极化检测器的工程设计提供重要参考,但目前针对其检测性能的评估理论仍不完善,尤其缺乏多视情形下的分析结果.文章以极化雷达多视协方差矩阵的复Wishart分布为基础,采用蒙特卡洛仿真与理论推导得到了7种经典极化检测器的多视检测性能曲线,并构建曲线下面积(Area Under Curve,AUC)指标对检测性能进行自动排序.仿真实验结果表明4视处理时的检测性能排序为:最优极化检测器>极化白化滤波器≈似然比检验>最佳能量检测器>极化匹配滤波器≈多视极化能量检测器>单通道检测器.理论推导结果表明,具有线性加权形式的极化检测器,其检测与虚警概率都具有两类等价的数学表达式,其中基于Gamma函数的表达式可用于快速计算出恒虚警检测门限.最后采用全极化合成孔径雷达实测数据,对上述结论进行了验证.Contrastive analysis of the performances of radar polarimetric detectors Can provide impor- tant reference for its design, while the detection performance evaluation theory is still imperfect, especially lacking of the analysis results for multi-look case. Based on the complex Wishart distribution of the polari- metric radar multi-look covariance matrix, a contrastive analysis of the performance of 7 classical polarime- tric detectors is presented using both Monte Carlo simulations and analytical method after an area under curve （AUC） index is proposed for evaluation. The ranking result for 4-look case is. Optimal polarimetric detector （OPD）〉 polarimetric whitening filter （PWF）≈identity likelihood ratio test （ILRT）〉 optimal sapn detector （OSD）〉 polarimetric matched filter （PMF）≈ span detector （SD）〉 single channel detector （SCD）. At the same time, a novel approach to compute the constant false-alarm rate （CFAR） threshold is proposed based on Gamma function, and two kinds of general mathematical expressions of the theoretical performances of those detectors with linearly weighted form are also derived for multi-look case. Finally, the polarimetric SAR data is used to verify the above results.

关 键 词：雷达极化 多视处理 检测性能 CFAR门限 

分 类 号：TN95[电子电信—信号与信息处理]